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In frequency domain terminology, which of the following is defined as “obtaining a highpass filtered image by subtracting from the given image a lowpass filtered version of itself”?

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In frequency domain terminology, which of the following is defined as “obtaining a highpass filtered image by subtracting from the given image a lowpass filtered version of itself”?

(a) Emphasis filtering

(b) Unsharp masking

(c) Butterworth filtering

(d) None of the mentioned

The question was asked in an online quiz.

Question is taken from Unsharp Masking, High-boost filtering and Emphasis Filtering in portion Intensity Transformations and Spatial Filtering of Digital Image Processing

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Right choice is (b) Unsharp masking

The explanation: In frequency domain terminology unsharp masking is defined as “obtaining a highpass filtered image by subtracting from the given image a lowpass filtered version of itself”.

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